1. Thermoplastic:
1.1 Definition: A polymer capable repeated the soft flowing under the effect of heat and harden (shaped) as they cool. During thermal effects, thermoplastic only change the physical properties, no chemical reaction occurs. Capable of regenerating repeatedly
eg cables, bottles, packaging, soda bottle caps, body and lid pens ... etc.
1.2 Features:
This type of soft plastic or discharge if heated. Plasticizers achieve soft or melted status is injected into the mold cavity during molding. When slashed plastic heat will harden (solidifies).
Plastic can harden soft back under the action of heat.
thermoplastic plastics can be separated into crystalline plastics (crystalline plastics) and amorphous plastics ( amorphous plastics), both of which can be used for injection molding.
The cycle molding (molding cycle) may be shorter than thermoset plastics.
Here are the products of thermoplastics.
2. Thermoset Plastics:
2.1 Definition: A type of polymer materials when subjected to temperature, pressure, catalyst or hardener will occur chemical reaction converted into 3D structures, unable melt when heated power again. There is no capacity for regeneration of discarded materials, faulty products or products used.
Example: The cover of ships, boats, adhesives, ... etc
2.2 Characteristics:
This type soft plastic when heat resistant but not melted . The plastic is extruded into the interior cavity mold when it is soft. This material caking slower due to a chemical reaction by the increase in temperature.
thermoset plastics when it will not harden the same whether software is heated.
The thermosetting plastics are plastics amorphous, something incompatible with injection molding.
The process with the plastics molding is longer.
đang được dịch, vui lòng đợi..